Neil Diamond, 71, announced his engagement to Katie McNeil, about age 41, last year. They're pictured at the Kennedy Center Honors hosted by Secretary of State Hillary Rodham Clinton last December.

Neil Diamond, 71, announced his engagement to Katie McNeil, about age 41, last year. They're pictured at the Kennedy Center Honors hosted by Secretary of State Hillary Rodham Clinton last December.

Photo: Pool / Getty Images

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Nicolas Cage, 48, and third wife, Alice Kim Cage, about 28, at "The Sorcerer's Apprentice" premierie in 2010.

Nicolas Cage, 48, and third wife, Alice Kim Cage, about 28, at "The Sorcerer's Apprentice" premierie in 2010.

Photo: Jemal Countess / Getty Images

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Alec Baldwin, 53, and yoga-teacher girlfriend Hilaria Thomas, who's 27 or 28, at the NFL Honors and Pepsi Rookie of the Year event on Feb. 4.

Alec Baldwin, 53, and yoga-teacher girlfriend Hilaria Thomas, who's 27 or 28, at the NFL Honors and Pepsi Rookie of the Year event on Feb. 4.

Photo: Mike Coppola / Getty Images for Pepsi

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George Clooney, 50, and girlfriend Stacy Keibler, 32, at the Academy Awards on Feb. 26.

George Clooney, 50, and girlfriend Stacy Keibler, 32, at the Academy Awards on Feb. 26.

Photo: FREDERIC J. BROWN / AFP/Getty Images

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Donald Trump, 65, with wife Melania Trump, 41, at the premiere of "Tower Heist" last October.

Donald Trump, 65, with wife Melania Trump, 41, at the premiere of "Tower Heist" last October.

Photo: Theo Wargo / Getty Images

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Edward James Olmos. 65, with third wife, Lymari Nadal, 34, at the LA Latino Film Festival in 2010.

Edward James Olmos. 65, with third wife, Lymari Nadal, 34, at the LA Latino Film Festival in 2010.

Photo: Noel Vasquez / Getty Images

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Stanley Tucci, 51, and fiancee Felicity Blunt, who is 31 or 32 years old, at Mercedes-Benz Fashion Week Feb. 15. Blunt is the sister of actor Emily Blunt, who co-starred with Tucci in "The Devil Wears Prada."

Stanley Tucci, 51, and fiancee Felicity Blunt, who is 31 or 32 years old, at Mercedes-Benz Fashion Week Feb. 15. Blunt is the sister of actor Emily Blunt, who co-starred with Tucci in "The Devil Wears Prada."

Photo: Stephen Lovekin / Getty Images for Mercedes-Benz F

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Rod Stewart, 67, and wife Penny Lancaster, 40, at a London fundraiser in December.

Rod Stewart, 67, and wife Penny Lancaster, 40, at a London fundraiser in December.

Mick Jagger, 68, with designer girlfriend L'Wren Scott, 45, at a party in New York City last year.

Mick Jagger, 68, with designer girlfriend L'Wren Scott, 45, at a party in New York City last year.

Photo: Stephen Lovekin / Getty Images

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Joan Collins, 78, and husband Percy Gibson, 46, at a Grammy party on Feb. 11 in Beverly Hills.

Joan Collins, 78, and husband Percy Gibson, 46, at a Grammy party on Feb. 11 in Beverly Hills.

Photo: Kevin Winter / Getty Images

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Actors Harrison Ford, 69, and Calista Flockhart, 47, at the Golden Globes in January. They were married in 2010.

Actors Harrison Ford, 69, and Calista Flockhart, 47, at the Golden Globes in January. They were married in 2010.

Photo: Frazer Harrison / Getty Images

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Most famous local oldster-babe couple? That would be Vili Fualaau, 28, and Mary K. Letourneau, 50, who began their relationship when she was his sixth-grade teacher. After she went to prison for child rape, they were married in 2005 (the year this photo was taken). less

Most famous local oldster-babe couple? That would be Vili Fualaau, 28, and Mary K. Letourneau, 50, who began their relationship when she was his sixth-grade teacher. After she went to prison for child rape, ... more